In the "Cambridge Manuals of Science and Literature" (Cam- bridge
University Press, ls. net per volume) we have a very valuable series of books which combine in a very happy way a. popular presentation of scientific truth along with the accuracy of treatment which in such subjects is essential. High among them. for importance of subject and for thoroughness we should rank Prehistoric Man, by W. H. L. Duckworth. Research con- tinues to push back to a more and more remote antiquity the existence of the human race. The descent of man from the ape is a theory which does not seem to gain ground : many things seem to point to " a greater antiquity of the higher type of human skeleton." A kindred topic is treated in Primitive Animals, by Geoffrey Smith. A very interesting volume is The Migration of Birds, by T. A. Coward, with its curious demonstra- tions of the mechanical side of the subject. Other provinces of natural history are dealt with in Links with the Past in the Plant World, by A. S. Seward, and Earthworms and their Allies the Natural History of Clay, by A. B. Searle, is largely devoted to the manufacturing uses of this substance. In the application of science to the uses of life we have The Modern Locomotive, by C.. Edgar Allen.
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